Vanessa,
Thank you for your fast reply but this answer does not help me. First, it lists calling but I am not interested in calling. I am only interested in texting. Secondly, the link you provided is a subscription addon that costs an additional cost.
I would like to know what countries are included with the Simple Choice Plan for texting. The people I spoke with on the phone at T-Mobile Support told me that over 200 countries are covered but I could not find that list.
Thank you